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95f25efe WS |
1 | /* |
2 | * Freescale eSDHC i.MX controller driver for the platform bus. | |
3 | * | |
4 | * derived from the OF-version. | |
5 | * | |
6 | * Copyright (c) 2010 Pengutronix e.K. | |
7 | * Author: Wolfram Sang <w.sang@pengutronix.de> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License. | |
12 | */ | |
13 | ||
14 | #include <linux/io.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/mmc/host.h> | |
19 | #include <linux/mmc/sdhci-pltfm.h> | |
20 | #include "sdhci.h" | |
21 | #include "sdhci-pltfm.h" | |
22 | #include "sdhci-esdhc.h" | |
23 | ||
24 | static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg) | |
25 | { | |
26 | void __iomem *base = host->ioaddr + (reg & ~0x3); | |
27 | u32 shift = (reg & 0x3) * 8; | |
28 | ||
29 | writel(((readl(base) & ~(mask << shift)) | (val << shift)), base); | |
30 | } | |
31 | ||
32 | static u16 esdhc_readw_le(struct sdhci_host *host, int reg) | |
33 | { | |
34 | if (unlikely(reg == SDHCI_HOST_VERSION)) | |
35 | reg ^= 2; | |
36 | ||
37 | return readw(host->ioaddr + reg); | |
38 | } | |
39 | ||
40 | static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg) | |
41 | { | |
42 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
43 | ||
44 | switch (reg) { | |
45 | case SDHCI_TRANSFER_MODE: | |
46 | /* | |
47 | * Postpone this write, we must do it together with a | |
48 | * command write that is down below. | |
49 | */ | |
50 | pltfm_host->scratchpad = val; | |
51 | return; | |
52 | case SDHCI_COMMAND: | |
53 | writel(val << 16 | pltfm_host->scratchpad, | |
54 | host->ioaddr + SDHCI_TRANSFER_MODE); | |
55 | return; | |
56 | case SDHCI_BLOCK_SIZE: | |
57 | val &= ~SDHCI_MAKE_BLKSZ(0x7, 0); | |
58 | break; | |
59 | } | |
60 | esdhc_clrset_le(host, 0xffff, val, reg); | |
61 | } | |
62 | ||
63 | static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg) | |
64 | { | |
65 | u32 new_val; | |
66 | ||
67 | switch (reg) { | |
68 | case SDHCI_POWER_CONTROL: | |
69 | /* | |
70 | * FSL put some DMA bits here | |
71 | * If your board has a regulator, code should be here | |
72 | */ | |
73 | return; | |
74 | case SDHCI_HOST_CONTROL: | |
75 | /* FSL messed up here, so we can just keep those two */ | |
76 | new_val = val & (SDHCI_CTRL_LED | SDHCI_CTRL_4BITBUS); | |
77 | /* ensure the endianess */ | |
78 | new_val |= ESDHC_HOST_CONTROL_LE; | |
79 | /* DMA mode bits are shifted */ | |
80 | new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5; | |
81 | ||
82 | esdhc_clrset_le(host, 0xffff, new_val, reg); | |
83 | return; | |
84 | } | |
85 | esdhc_clrset_le(host, 0xff, val, reg); | |
86 | } | |
87 | ||
88 | static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host) | |
89 | { | |
90 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
91 | ||
92 | return clk_get_rate(pltfm_host->clk); | |
93 | } | |
94 | ||
95 | static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host) | |
96 | { | |
97 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
98 | ||
99 | return clk_get_rate(pltfm_host->clk) / 256 / 16; | |
100 | } | |
101 | ||
102 | static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata) | |
103 | { | |
104 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
105 | struct clk *clk; | |
106 | ||
107 | clk = clk_get(mmc_dev(host->mmc), NULL); | |
108 | if (IS_ERR(clk)) { | |
109 | dev_err(mmc_dev(host->mmc), "clk err\n"); | |
110 | return PTR_ERR(clk); | |
111 | } | |
112 | clk_enable(clk); | |
113 | pltfm_host->clk = clk; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static void esdhc_pltfm_exit(struct sdhci_host *host) | |
119 | { | |
120 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
121 | ||
122 | clk_disable(pltfm_host->clk); | |
123 | clk_put(pltfm_host->clk); | |
124 | } | |
125 | ||
126 | static struct sdhci_ops sdhci_esdhc_ops = { | |
127 | .read_w = esdhc_readw_le, | |
128 | .write_w = esdhc_writew_le, | |
129 | .write_b = esdhc_writeb_le, | |
130 | .set_clock = esdhc_set_clock, | |
131 | .get_max_clock = esdhc_pltfm_get_max_clock, | |
132 | .get_min_clock = esdhc_pltfm_get_min_clock, | |
133 | }; | |
134 | ||
135 | struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = { | |
136 | .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_MULTIBLOCK | |
137 | | SDHCI_QUIRK_BROKEN_ADMA, | |
138 | /* ADMA has issues. Might be fixable */ | |
139 | /* NO_MULTIBLOCK might be MX35 only (Errata: ENGcm07207) */ | |
140 | .ops = &sdhci_esdhc_ops, | |
141 | .init = esdhc_pltfm_init, | |
142 | .exit = esdhc_pltfm_exit, | |
143 | }; |